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7970 VRM temps!?!?

Tbh I'm starting to think the VRM temps really make little difference as long as they are under 125.c. I have had them up to 108.c on this reference 7970 and have noticed no issues or i'll effects. Even running the card without any VRM sinks does little to heat them up and only a few .c difference between with and without sinks.

I cannot get them hot enough to force the core to shutdown. Even running furmark and insulating tape on them only managed 109.c which is still well within limits.

Upping the voltage and clock speeds seems to make very little difference in temps to the VRM's only a few .c more but has huge effects on core and ram temps. Too much voltage 1.2v + causes artifacting and freezes but the VRM temps are still within tolerances.

I'm betting most problems people are having is more due to running high voltages and the core or memory hitting it's limits before the VRM's..
 
It seems to vary from card to card.
I consistently saw artifacting when the VRM's pushed over 75°C in heaven and that's
with fairly low voltages of 1.131-1.15v. Not sure about games. With the stock cooler in a closed case I saw it hit 99°C with lots of nice multicoloured artifacts to let me know :D
Upping clock/voltages had a direct affect on VRM temps in my case too.

Other cards may be more tolerant.
 
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Uncle Petey said:
@Tommy and OP,

I took off the slim sinks on the VRM's and replaced them with the big one.
Here's a comparison of the big and small ones using thermal tape and thermal glue in my setup (The glue isn't permanent btw, it dries in a rubbery way like sealant).
Click to expand...

How exactly did you remove the thermal glue? It seems pretty solid and I'm scared to pull too hard. Did you use lighter fluid as mentioned above?

Cheers :)
 
jh30uk said:
If its like Arctic Silver Epoxy, a stint in the freezer (inside a sealed bag) weakens the bond.
Click to expand...

thanks for the reply :)

isn't there danger of the card frosting over?
- are we talking like 30mins in the freezer?


Five.Stars said:
Wow this thread is a blast from the past. My 7970 VRM's never go much above 40 degrees now on both cards ;)
Click to expand...

haha, it sure is.


What cooler do you have on your cards?
 
Success!!!

And then a bit more cleaning, and it's ready for some PROPER VRM heatsinks!

- i like the look of the Apelfohn sinks, that you (Uncle Petey) used here. However i can't find them in stock anywhere!
Do you know anywhere that stocks them, or similar quality ones?


Also, with regards to my removal method, i actually used the 'nipple cripple' technique; grab and twist. On the stiffer ones, i wobbled them until there was a bit of movement, and then twisted. Then, i used a flat head screwdriver to scrape the bulk of the glue off, and then acetone on a q-tip to scrub a bit more. Finally, i used a rubber/eraser to clean them off, ready for new heatsinks!

thanks for your help guys! and if you know where i can buy VRAM and VRM heatsinks, please let me know :)
 
What do you think to my VRM mod?? Just completed it this afternoon.

780 ti Lightening 1700mhz 1.41V OCP/OVP with any more volts. So I E-Powered it!!! you will take 1.65V+ Bit@h!! 1900+ Core is my aim!!





Even soldered in two volt meters one for core and one for mems. Core output on E Power is controlled by Evbot.



Most cards cant go 100C on VRM to be honest. It then warps PCB or damages components. Your close to this you need to back off or add extra cooling. I will place fan on E Power Heatsink but its massively overkill for VRM anyway. Original Lightening VRM is doing mems and PLL and can be fully controlled by ABX.
 
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Its called an E Power by EVGA. They developed em for Titan as they had no use for overclocking without uprated VRM.

They can be bought like that. Then you add em to any card to bolster and control core output exactly. Its not as simple as just soldering on of course depending on the pcb layout PLL voltages have to be forced, Vmem also. Caps removed and so on and so on. On the Lightning I had to remove the Core IC and memory controllers from PCB to force mem volts.
 
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martinoheat said:
thanks for the reply :)

isn't there danger of the card frosting over?
- are we talking like 30mins in the freezer?




haha, it sure is.


What cooler do you have on your cards?
Click to expand...

Couple of slabs of copper made by the fine people of EK. The VRM's and core all keep the same temps now roughly, which tells me that VRM cooling on the Accelero isn't as good as it should be when the temps can get 30-40 degrees higher than the core. But, in saying that, from what I gather the VRM's are good for up to 125 degrees, so perhaps cooling them isn't all that hugely important.
 
I eventually got the crappy heatsinks off and returned the card to stock. - I managed to carefully twist off the heatsinks then clean up the adhesive with acetone.

I'll be buying some heavier-duty VRAM and VRM heatsinks before refitting the accelero.
 
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